Take-up for sewing-machines.



J. DIEHL.

TAKE-UP FOR SEWING MACHINES. APPLICATION FILED JULY 2, 1907.

Patented Jan. 11,1910.

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TAKE-UP FOR SEWING MAGHINES.

APPLICATION FILED JULY 2, 1907. 946 01 9 Patented Jan. 11, 1910.

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JACOB DIEHL, 01E CLEVELAND, OHIO, ASSIGNOB IO THE STANDARD SEWING MAGHIN CQMPANY, F CLEVELAND, OHIO, A CORPORATION OF OHIO.

TAKE-UP FOR SEVJING-MAGHINES.

Specification of Letters Patent.

Application filed July 2, 1907.

Patented Jan. 11, 1910.

Serial No. 381,861.

To all whom it may concern:

Be it known that I, JACOB DIEHL, citizen of the l nited States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Take-Ups for Sewing- Machines, of which the following is a specification.

My present invention relates particularly to improvements in that type of take-up mechanism in which a take-up lever is fillcrumed on a movable or swinging support and actuated from a rotating crank; such type of take-up mechanism being desirable in that the use of cams and the objectionable wear and friction incident thereto is avoided. In this type of take-up mechanism, the takeup lever is usually-connected directly to a crank-pin which is fixedly attached to the actuating crank and therefore movable in a path concentric with the axis of the crank. I have found in practice, however, that a take-up lever so connected and operated does not coiiperate with the other stitchforming elements of a rotary shuttle sewing machine, in a manner to control the thread with that degree of nicety necessary to produce the most desirable stitching.

It has therefore been the object of my present invention to improve such type of take-up mechanism with a view to adapting it to more completely controlling the thread during the stitch forming operation and thereby producing improved stitching.

To this end, my invention consists in the novel features of construction and combinations of parts hereinafter set forth in detail and pointed out in the appended claims.

Referrin now to the accompanying drawings formina part of this specification, and in which I have shown only so much of a sewing machine as is necessary to illustrate my invention, Figures 1 to inclusive are front end views of a part of the machine, with the face-plate removed from the arm thereof, showing the relative positions of the needle, shuttle, and take-up at diiierent times during the formation of a stitch. Fig. 6 is a side elevation of the parts in the position shown in Fig. 3, with the arm in vertical section to more clearly show the connection between the needle-bar and the take-up and their actuating crank.

Similar reference characters designate corresponding parts in the several figures of the drawings, in which the frame of the machine comprising the bed-plate l and overhanging bracketarm 2, the driving shaft 3 with its attached crank 4:, the needlebar 5 with its attached needle 6, and the rotary shuttle 7, are all of usual construction andoperation as found in the Standard sewing machine. Also as in said Standard and other similar machines, the needlehar 5 is actuated from the crank 4 in the usual manner by means of a pitman 8 which connects with a pin 9 at the upper end of the needle-bar and with a crank-pin 10 on the crank 4e.

In take-up mechanism of the type embodying my present invention, the take-up lever, as hereinbefore mentioned, is generally connected directly to a crank-pin which is rigidly attached to the actuating crank and therefore movable in a path concentric with the axis of said crank. In accordance with my present invention, however,tlie pitman 8 connecting the crank and needle-bar is formed with a riQid arm or extension 11 for the connection therewith of the take-up lever, which arm or extension at .its end or point of connection with the take-up lever w ll be caused to move in the path of an ellipse, as indicated by dotted lines, and therefore in a path eccentric to the axis of the crank-pin rather than concentrio with it. This change in the path of movement of the take-up lever actuating device from a circular path concentric with the axis of the crank, as heretofore, to an elliptical path eccentric to the axis of the crank, results in a movement of the take-up lever such as will cause it to accurately and completely control the thread in co'c'peration with the needle and shuttle in a manner as will presently be described.

The take-up lever, indicated at 12, is substantially straight and is pi otally connected at its inner end to the pitman extension 11 and at its outer end is provided with a thread-receiving eye. At a point between its ends this take-up lever is pivotally connected with one end of a link 14 which at its opposite end is mounted on a stationary pivot 15; this link being cocperative with the pitman extension 11 in supporting the take-up lever and controlling the movement of the same.

The action of the take-up in cooperation with the needle and shuttle in controlling the thread is shown in Figs. 1 to 5 inclusive. In Fig. l the thread-engaging end of the take-up is at substantially its lowest point preparatory to drawing up the thread loop ust being cast off by the shuttle. From the position shown in Fig. 1 the take-up moves upwardly in drawing up the thread to the position shown in Fig. 2, and from thence to the position shown in Fig. 3; the movement of the take-up from the position shown in Fig. 2 to that shown in Fig. 8 being upwardly and laterally in the arc of a relatively large curve and thereby operating to tighten the stitch gradually and produce an elastic formation of the same, as is very desirable. From the position shown in Fig. 3 to that shown in Fig. 4: the take-up moves downwardly in substantially the same time as the needle and gives down just enough thread as is required by the needlewithout the formation of any undue slack. At the time the take-up reaches the position shown in Fig. 4, the needle has reached its lowest limit of movement and is about to ascend to throw out the thread loop to be entered by the shuttle. The thread required for the formation of this loop is provided by the take-up in its continued downward movement from the position shown in Fig. 4 to that shown in Fig. 5. From the latter position to that shown in Fig. 1 the take-up further continues its downward movement to provide the necessary thread required by the shuttle in carrying the thread loop therearound, and moves in such time relatively to the shuttle as to provide the required length of thread without the formation of any undue slack. When the parts reach the position shown in Fig. 2 the shuttle is about to cast off the thread loop and the take-up about to begin its upward movement to draw up said cast-off loop and complete the stitch.

The pitman 8 with its arm or extension 11 constitutes a pitman-lever and is so designated in the following claims.

What I claim is:

1. In a sewing machine, the combination of a rotary driving crank, a reciprocatory needle-bar, a take-up lever, a pitman-lever connected at a point between its ends with the crank and at its opposite ends with the needle-bar and take-up lever respectively, and a bodily movable fulcrum carrying the take-up lever at a point between its ends, the several said parts being organized and operative to move the thread-engaging end of the take-up lever in the are of a relatively large curve during the stitch-tightening operation and thereby produce an elastic formation of stitch.

2. In a sewing machine, the combination of a rotary driving crank, a reciprocatory needle-bar, a take-up lever, a pitman-lever connected at a point between its ends with the crank and at its opposite ends with the needle-bar and take-up lever respectively, and a link connected at one end to a stationary pivot and at its opposite end to the take-up lever and being cooperative with the pitman-lever, the several said parts being organized and operative to move the threadengaging end of the take-up lever in the arc of a relatively large curve during the stitchtightening operation and. thereby produce an elastic formation of stitch.

3. In a sewing machine, the combination of a rotary driving crank, a reciprocatory needle-bar, a substantially straight take-up lever, a pitman-lever connected at a point between its ends with the crank and at one end having connection with the needle-bar and at its opposite end having connection with one end of the take-up lever, and a pivoted link connecting with the take-up lever at a point between its ends, the several said parts being organized and operative to move the thread-engaging end of the take-up lever in the arc of a relatively large curve during the stitch-tightening operation and thereby produce an elastic formation of stitch.

4-. In a sewing machine, the combination of a rotary driving crank, a reciprocatory needle-bar, a takeup lever, a pitman-lever connected at a point between its ends with the crank and at one end having connection with the needle-bar and at its opposite end having connection with one end of the takeup lever, and a link connected at one end to a stationary pivot and at its opposite end connected to the take-up lever at a point between its ends, the several said parts being organized and operative to move the threadengaging end of the take-up lever in the arc of a relatively large curve during the stitch-tightening operation and thereby produce an elastic formation of stitch.

Signed at Cleveland, in the county of Cuyahoga, and State of Ohio, this 17th day of June, A. D. 1907.

JACOB DIEHL.

Witnesses CHAS. C. EMMONS, H. W. CORNING. 

